What model year do you have? The 70 and 71 road lamp switch, wiring and relay are all different for those two year. The only thing in common is the plastic fog light bezel. It really is an apples and oranges difference. The 70 road lamps could be used with the high beams on. In 71, power to drive the road lamps came from the low beams only. So they automatically would turn off if the high beams went on and turned back on when the high beams were turned off. Just like modern day cars with road lamps.
The switch mounts into the D shaped hole along with a small hole for the bezel pin to help keep it straight on the bottom dash frame rail between the door and the steering column.
Jim